[Medullary sponge kidney: a short review and a report of two cases (author's transl)]

Radiologically the collecting tubules in the medulla are dilated up to cystic proportions. There may be no clinical symptoms, but frequently the dilated tubules predispose to infection and lithiasis. Such cysts do not interfere with renal function. X-ray diagnosis, frequency, therapy and etiology are discussed. Two further cases of MSK in childhood are described.